"share some of the costs of this ramp in order to mine their chromite instead of our own."

I think it occured to KWG way back when they drilled that hole on the border with Noront at the possibility of shared underground tunnel and facilities.

That plus the testing of continuity of ore across the border was their reason for drilling. Next, no results published and probably no assays done on the cores, just visuals and unofficial hand held metering to avoid being forced to release results.

All that tells me it is very likely that sharing would not only be economical but practical.

( Correction? Not 'instead' but in tandem with Noront.)